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numpy.fromstring unable to parse values > 2^32 on 32 bit arch #4575

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jpwhite4 opened this issue Apr 1, 2014 · 1 comment · Fixed by #4712
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numpy.fromstring unable to parse values > 2^32 on 32 bit arch #4575

jpwhite4 opened this issue Apr 1, 2014 · 1 comment · Fixed by #4712

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@jpwhite4
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jpwhite4 commented Apr 1, 2014

Steps to reproduce:
run the following command on a 32 bit x86 python:

numpy.fromstring( "25041670086757 104783749223640", dtype=numpy.uint64, sep=' ')

and the incorrect output is:

array([4294967295, 4294967295], dtype=uint64)

If the same command is executed on a 64 bit machine, the output appears correct:

array([ 25041670086757, 104783749223640], dtype=uint64)

Versions tested:
numpy 1.8.1
Python 2.7.3 (default, Feb 27 2014, 20:00:17) [GCC 4.6.3] on linux2
abalkin added a commit to abalkin/numpy that referenced this issue Apr 2, 2014
@abalkin
BUG: Fix string to uint64 conversion on 32-bit platforms.
7eb7e4f 
Fixes numpy#4575.
@abalkin abalkin mentioned this issue Apr 2, 2014
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@abalkin
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abalkin commented Apr 2, 2014

gh-4577 is a "proof of concept" patch. It fixes the issue for 32-bit python on MacOS, but I have not tested it anywhere else. The problem is that Python does not provide cross-platform PyOS_ versions of strtoll and strtoull, so I created my own.

@juliantaylor juliantaylor mentioned this issue May 14, 2014
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juliantaylor added a commit to juliantaylor/numpy that referenced this issue May 14, 2014
@juliantaylor
BUG: Fix string to int64 conversion on 32-bit platforms
ceffd04 
closes numpygh-4575
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